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Thread: really confused PLEASE HELP

  1. May 7th 2009, 07:40 PM #1
    BaBrown1s
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    really confused PLEASE HELP

    Ok I have this word problem i am confused on. It says a test has 4 choices a, b, c, and d if a student answers all 3 questions what is the probability they got all of them correct???

    Any help would be greatly appreciated.
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  2. May 7th 2009, 10:32 PM #2
    CaptainBlack
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    Quote Originally Posted by BaBrown1s View Post
    Ok I have this word problem i am confused on. It says a test has 4 choices a, b, c, and d if a student answers all 3 questions what is the probability they got all of them correct???

    Any help would be greatly appreciated.
    Probability of getting any one question right when choosing at random is 0.25 (four possibilities, only one of which is correct).

    Probability of getting three out of three right is 0.25^3.

    CB
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